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7x3 Timber

Our heavy-duty 7x3 timber is designed for demanding structural applications, including load-bearing walls, roof joists and large-scale framing, for reliable performance in indoor and outdoor builds where strength is key.

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  • C24%2070x170%20Main.jpg.jpeg C24%2070x170%20Top%20Angle.jpg.jpeg

    C24 Timber Joists Untreated Kiln Dried Regularised PEFC 75 x 175mm (7x3)

    £11.25 - £64.69 per piece (Ex VAT)
    £13.50 - £77.63 per piece (Inc VAT)
    C16 and C24 are strength grades; the higher the grade, the better the load bearing quality it has. C16 is normally the grade that is produced from faster grown UK timber. C24 is a premium product as the wood is slower grown and is also denser. Higher...
    £11.25 - £64.69 per piece (Ex VAT)
    £13.50 - £77.63 per piece (Inc VAT)
  • C24%2044x170%20Main.jpg.jpeg C24%2044x170%20Top%20Angle.jpg.jpeg

    C24 Timber Joists UC2 Treated Kiln Dried Regularised PEFC 75 x 175mm (7x3)

    £12.11 - £69.65 per piece (Ex VAT)
    £14.53 - £83.58 per piece (Inc VAT)
    C16 and C24 are strength grades; the higher the grade, the better the load bearing quality it has. C16 is normally the grade that is produced from faster grown UK timber. C24 is a premium product as the wood is slower grown and is also denser. Higher...
    £12.11 - £69.65 per piece (Ex VAT)
    £14.53 - £83.58 per piece (Inc VAT)
  • C24%2070x170%20Main.jpg.jpeg C24%2070x170%20Top%20Angle.jpg.jpeg

    C16 Timber Joists Untreated Kiln Dried Regularised FSC 75 x 175mm (7x3)

    C16 and C24 are strength grades; the higher the grade, the better the load bearing quality it has. C16 is normally the grade that is produced from faster grown UK timber. C24 is a premium product as the wood is slower grown and is also denser. Higher...
  • C24%2044x170%20Main.jpg.jpeg C24%2044x170%20Top%20Angle.jpg.jpeg

    C24 Timber Joists UC2 Treated Kiln Dried Regularised FSC 75 x 175mm (7x3)

    £12.11 - £69.65 per piece (Ex VAT)
    £14.53 - £83.58 per piece (Inc VAT)
    C16 and C24 are strength grades; the higher the grade, the better the load bearing quality it has. C16 is normally the grade that is produced from faster grown UK timber. C24 is a premium product as the wood is slower grown and is also denser. Higher...
    £12.11 - £69.65 per piece (Ex VAT)
    £14.53 - £83.58 per piece (Inc VAT)
  • C24%2070x170%20Treated%20Main.jpg.jpeg C24%2070x170%20Treated%20Top.jpg.jpeg

    C16 Timber Joists UC3u Treated Kiln Dried Regularised FSC 75 x 175mm (7x3)

    These C16 carcassing timber lengths are UC3u treated timber, meaning they perfect for outdoor use providing it is above ground. Carcassing is a generic trade term which refers to the use of a species of timber. Spruce/Pine and Fir are used to form...
  • C24%2070x170%20Main.jpg.jpeg C24%2070x170%20Top%20Angle.jpg.jpeg

    C24 Timber Joists Untreated Kiln Dried Regularised FSC 75 x 175mm (7x3)

    £11.25 - £64.69 per piece (Ex VAT)
    £13.50 - £77.63 per piece (Inc VAT)
    It is machined to have rounded edges, smooth faces, and sides, for a more uniform piece of timber. It is kiln dried to minimise moisture content and improve strength and stability. The finished size you will receive is 70mm x 170mm. C16 and C24 are...
    £11.25 - £64.69 per piece (Ex VAT)
    £13.50 - £77.63 per piece (Inc VAT)

  • C24 Timber Joists Untreated Kiln Dried Regularised PEFC 75 x 175mm (7x3)

    This premium C24 graded carcassing timber is kiln-dried for maximum stability, strength, and durability. With a nominal size of 75 x 175mm and a finished size of approximately 70 x 195mm UC3u Treatment Class Crafted from UC3u treated timber, these...

  • C24 Timber Joists Untreated Kiln Dried Regularised PEFC Premium Length 75 x 175mm (7x3)

    This premium C24 graded carcassing timber is kiln-dried for maximum stability, strength, and durability. With a nominal size of 75 x 175mm and a finished size of approximately 70 x 195mm UC3u Treatment Class Crafted from UC3u treated timber, these...

Our 7x3 timber is pressure treated and suitable for indoor and outdoor use for joists, rafters and load-bearing frames. With excellent strength and stability, this timber size is ideal for both professional construction and robust DIY projects.

Why choose 7x3 timber?

Heavy-duty 7x3 timber is designed for situations where extra width and strength are required. Common uses include:

  • Roof joists and rafters
  • Load-bearing walls
  • Large-scale frames
  • Structural applications

    • What is 7x3 timber in mm?

    7x3 timber is approximately 75mm x 175mm.

    Sizes and options

    We stock 7x3 timber in a variety of lengths to suit your project needs. It's also available in both C24 and C16 grades.

    Shop our full range for reliable, long-lasting construction materials. Strong, stable and versatile – perfect for any structural project.